tiger



(No Model.)

P. E. VIGER. CHISEL FOR MORTISING MAGHINES.

No. 469,360. Patented Feb. 23, 1892.

UNITED STATES PATENT OFFICE.

FRANQOIS E. VIGER, OF LONGUEUIL, CANADA.

CHISEL FOR MQRTISING=MACHINES.

srncrrrcarxon forming part of Letters Patent No. 469,360, dated February23, 1892.

Application filed July 9, 1891. Serial No. 398,968. (No model.)

To all whom it may concern:

Beitknownthatl,FRAN OIsEUsEBEV'IGEE, a citizen of the Dominion ofCanada, residing at the town of Longueuil, in the county of Chambly andProvince of Quebec, Canada, have invented certain new and usefulImprovements in Chiselsforlllortising-lvlachines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention has reference to chisels for mortising-machines, wherebythe shavings are automatically thrown out, this being accomplished bytwo projections, one placed on each side of the bevel cutting-edge ofthe ordinary chisels, as shall be shown hereinafter.

My invention has for its object to provide chisels for lnortisingmachines which will greatly augment their capacity.

My invention simply consists in the convexprojections A and B, whichform one piece with chisel 0. As can be seen in cross-section in Fig. 4,they form a dovetail recess on the bevel K of the cutting-edge I, andthe distance E F is somewhat longer than the one G H, so that a shavingbeing cut out by the cutting-edge I is held in the dovetail J, formed bythe projectionsA B and the bevel-edge K, and as it is forced down thechip or shaving is forced up through the dovetail recess J, and, as thedistance G H is smaller than the one E F, the moment it has passed thispoint G H it cannot fall back again through where it has passed, and asthis dovetail passage J widens out, as shown in Fig. 3, once past thepoint G H the chip or shaving passes out with ease, and, as it cannotreturn,it is thrown out each time the chisel comes down,for the new chipor shaving formed forces the one held in the dovetail J out.

The side portions of the recess formed by the projections A and B areconvex at their bottoms, where they join onto the beveled portion K, aswell as at their tops, as may be seen by the dotted lines in Fig. 3.This construction enables the chisel to seize the chips firmly andpermits the rear corners b to be rounded off, which is advantageous instarting a hole and also decreases the liability of the projections tobe broken off and enables avery shallow recess to be used effectively.This is of a great advantage on the plain chisels now in use, for theymerely out out the shaving and it falls back into the mortise, therebynecessitating its cleaning out, which always consumes a certain amountof time. The points G H may be at any convenient distance from the one EF.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s

A chisel for a lnortising-machine, provided with projections A B, havingflat outer and convex inner sides forming a dovetailed recess narrowerat the middle than at the ends, said sides being convex at their topsand also at their bottoms, where they join ontothe beveled portion K ofthe chisel, and having their rear corners b rounded off, substantiallyas described and shown.

In testimony whereof I have allix'ed my signature in presence of twowitnesses.

F. E. VI GER.

Witnesses:

J. D. DUOHARNE, F. X. MALO.

